How To Call A Method Inside A Singleton Class

Create singletone class.

package design.patern.singleton;

public class Singleton {

private static Singleton instance = null;

// Constructor should be private
private Singleton() {

}
 
// Create instance of class
public static Singleton getInstance() {
if (null == instance) {
instance = new Singleton();
}
return instance;
}

public void demoMethod() {
System.out.println("Print demoMethod");
}

public static void demoStaticMethod() {
System.out.println("Print demoStaticMethod");
}
}

package design.patern.singleton;

public class SingletonMainClass {

public static void main(String args[]){

        // Create instance of singleton class
Singleton inst = Singleton.getInstance();

System.out.println(inst.hashCode());

        // Call non static methos
inst.demoMethod();

        // Call static method
Singleton.demoStaticMethod();
}

}